7th Grade Mid-Term Flashcards - vS

osmosis

A plant cell placed in water will become larger. What process is responsible for the movement of water into the cell? A. cellular respiration B. active transport C. translation D. osmosis

rectangular

All of the following are typical shapes for bacteria except one. Which of the following is not a typical shape for bacteria? A. rectangular B. spiral C. rod-like D. round

All cells are parts of tissues.

All of the following statements are part of cell theory except: A. All organisms are made up of one or more cells. B. All cells carry on life activities. C. All cells are parts of tissues. D. All new cells come from pre-existing cells.

one or more cells

All organisms consist of _____________. A. one or more cells B. only one cell C. more than one cell D. something other than cells

tissues

In multicellular organisms, groups of cells that work together are called: A. cytoplasm. B. organelles. C. nuclei. D. tissues.

cell, many, cell, similarities, most likely gave rise to, are not alive

The _______________ is the basic unit of living things. This tenet is based on the fact that there are ______________ organisms that consist of one ___________. In the nineteenth century, scientists realized that multicellular organisms such as humans are made of trillions of cells. Today we know that the simplest organisms such as bacteria share ___________________ with multicellular organisms. Scientists believe that a bacteria-like organism _________________________________________ life on Earth. Viruses are a curious case for scientists interested in cell theory. Although there is some debate, most scientists believe that viruses ________________________ because they must infect cells to reproduce.

nucleus

The absence of which organelle separates bacteria from being classified as eukaryotes? A. nucleus B. cell wall C. ribosome D. cell membrane

osmosis

The diffusion of water through a cell membrane is called __________________. A. osmosis B. facilitated diffusion C. active transport D. endocytosis

Theodor Schwann's observation with a microscope of animal tissues

Which observation directly contributed to the cell theory stating that all organisms are made of one or more cells? A. Theodor Schwann's observation with a microscope of animal tissues B. Rudolf Virchow's observation with a microscope of cells dividing C. Robert Hooke's observation of tiny boxlike structures D. Anton van Leeuwenhoek's observation of pond scum

Square

Which of the following is not a typical shape of bacteria? A. round B. square C. rod-like D. spiral

All organisms are made of one or more cells.

Which statement supports the fact that humans contain many kinds of tissues? A. Cells break down food through the process of respiration. B. All organisms are made up of only one cell. C. Cells reproduce by a process known as mitosis. D. All organisms are made of one or more cells.

bacteria and archaea

Which two groups of organisms are classified as prokaryotes? A. euglena and paramecia B. protozoa and algae C. protists and fungi D. bacteria and archaea

It helps the plant use N2 (nitrogen).

A certain kind of bacteria grows on the roots of plants. Identify how it helps the plant. A. It helps the plant use O2 (oxygen). B. It helps the plant use N2 (nitrogen). C. It helps the plant use CO2 (carbon dioxide). D. It helps the plant use O2 (oxygen), N2 (nitrogen), and CO2 (carbon dioxide).

Water will move into the blood cell.

A red blood cell is placed in a beaker of pure water. Which statement correctly depicts what will immediately occur? A. No movement of water will occur. B. Water will move out of the blood cell. C. The cell will decrease in size. D. Water will move into the blood cell.

The organism is a prokaryote.

A student made this simple drawing of an organism. Which statement about this organism is best supported by the information given in the diagram? A. The organism is multicellular. B. The organism is autotrophic. C. The organism is a prokaryote. D. The organism is a parasite.

prokaryotic

A student observing cells with a microscope noticed the cells had membranes on the outside, but she did not see a nucleus. What type of cell was she looking at? A. prokaryotic B. mammal C. eukaryotic D. fungi

prokaryotes.

Bacteria and archaea are examples of: A. plants. B. fungi. C. prokaryotes. D. protists.

They can cause food to spoil.

Bacteria are helpful to humans in many ways. In which of the following ways are bacteria harmful to humans? A. They can be used to make buttermilk. B. They can cause food to spoil. C. They can be used to flavor cheese. D. They can produce insulin.

into the cucumber cells

Cell fluid is made of water with other substances dissolved into it. When a cucumber slice is placed into 100% pure water, which way will the water immediately begin to move? A. out of the cucumber cells B. into the cucumber cells C. water will move in and out equally D. water will not move (Yes, there is a very similar question to this one already.)

all organisms are made of one or more cells

Cell theory has three parts: The cell is the basic unit of life in all living things, all cells come from existing cells, and ______________. A. nonliving things are composed of cells B. the cell was discovered by Robert Hooke C. all organisms are made of one or more cells D. all cells are microscopic in size

cell membrane, microscopic size, a single chromosome, ribosomes

From the list, circle the aspects that all prokaryotic organisms have in common. cell membrane, microscopic size, immovability, spherical shape, a single chromosome, nucleus, the absence of genetic material, ribosomes, sexual reproduction, living in a colony

diffusion

Glucose moves from the bloodstream into cells, where it is in lower concentration. What process is responsible for this movement? A. endocytosis B. diffusion C. active transport D. osmosis

Cells in multicellular organisms are specialized to perform certain functions.

How are the cells in multicellular organisms different from those in single-celled organisms? A. Cells in multicellular organisms do not have nuclei. B. Cells in multicellular organisms are smaller than cells in single-celled organisms. C. Cells in multicellular organisms do not move. D. Cells in multicellular organisms are specialized to perform certain functions.

They help break down food.

Human intestines contain a huge number of E. coli bacteria. Identify their main function. A. They help bring oxygen to internal organs. B. They help remove carbon dioxide from internal organs. C. They help break down food. D. They help keep the intestines moist.

hot springs, hydrothermal vents, ice sheets, Swiss cheese

Identify the environments in which prokaryotic cells may be found. Circle all that apply.

Prokaryotic cells have no membrane-bound organelles, and eukaryotic cells do.

Identify the most complete description of the distinction between prokaryotic and eukaryotic cells. A. Prokaryotic cells have no nuclei, and eukaryotic cells do. B. Prokaryotic cells have no membrane-bound organelles, and eukaryotic cells do. C. Prokaryotic cells have no DNA, and eukaryotic cells do. D. Prokaryotic cells have no cytoplasm, and eukaryotic cells do.

into the cucumber cells

If a cucumber slice is placed into pure water, which way will the water move? A. out of the cucumber cells B. into the cucumber cells C. water will move in and out equally D. water will not move

Iodine will move into the bag.

In an experiment, a sealed bag containing starch solution is placed into a beaker containing iodine. The bag is permeable only to the iodine. Which statement correctly identifies what will occur? A. Iodine will move in and starch will move out of the bag. B. Iodine will move into the bag. C. Starch will move out of the bag. D. There will be no movement of iodine nor starch.

from C to A

In the system shown in the diagram, water molecules are most likely to diffuse in which direction? A. from B to D B. from A to B C. from C to A D. from C to D

All organisms are composed of one or more cells. The cell is the basic unit of life in all living things.

Matthias Schleiden and Theodor Schwann looked at plant and animal cells. Schwann wrote the first part of what is known as the cell theory. Which statement did he write? A. All organisms are composed of one or more cells. All cells come from existing cells. B. All organisms are composed of one or more cells. The cell is the basic unit of life in all living things. C. All cells come from existing cells. The cell is the basic unit of life in all living things. D. All cells are microscopic in size. All cells come from existing cells.

they produce wastes that decay teeth

Most bacteria are not harmful to humans. All of the following are ways bacteria are helpful except when ______________________. A. they digest milk sugar and produce yogurt B. they are altered to produce insulin C. they produce wastes that decay teeth D. they make antibiotics in large numbers

the passive transport of water across the cell membrane

Osmosis is a very important process that occurs in cells. Which of the following choices best describes osmosis? A. the passive transport of sugar across the cell membrane B. the active transport of sugar across the cell membrane C. the passive transport of water across the cell membrane D. the active transport of water across the cell membrane

movement of water through a membrane

Osmosis is described as ________________________ . A. movement of water through a membrane B. movement of a solution through a pipette C. active transport of a compound D. movement of a chemical through a porous membrane

water

Osmosis is the diffusion of ______ into or out of the cell through the cell membrane. A. waste B. water C. oxygen D. food

prokaryotic, binary fission, identical, single-

Paul is studying different kinds of cells. He found a group of cells that have no real nucleus or organelles. They are known as ____________________________. He watched then under a microscope and saw them making copies of themselves through a process known as ____________________________. At the end, he had ____________________________ cells that are ____________________________celled organisms.

bread, cheese, yogurt

Prokaryotes are used to help make many foods that we eat each day. Identify the foods that man uses bacteria to help make. Circle all that apply.

a nucleus

Prokaryotes have all of the following characteristics except one. Which characteristic do prokaryotes not have? A. cytoplasm B. a nucleus C. a cell membrane D. DNA

one circular chromosome

Prokaryotic cells have ________________. A. one circular chromosome B. one linear chromosome C. more than one circular chromosome D. more than one linear chromosome

smaller than

Prokaryotic cells tend to be _______________ eukaryotic cells. A. the same size as B. bigger or smaller than C. bigger than D. smaller than

The cell is the basic unit of life in all living things.

Schleiden and Schwann determined which of the following statements regarding the cell theory? A. All cells come from existing cells. B. All cells are microscopic in size. C. The cell was discovered by Anton van Leeuwenhoek. D. The cell is the basic unit of life in all living things.

prokaryotes

Single celled microscopic organisms without a nucleus are classified as A. eukaryotes B. prokaryotes C. protists D. fungi

Some use O2 (oxygen), and others do not.

Some bacteria are aerobic and others are anaerobic. What does this mean? A. Some use H2O (water), and others do not. B. Some use CO2 (carbon dioxide), and others do not. C. Some use air, and others do not. D. Some use O2 (oxygen), and others do not.

water will move into the sponge's cells causing it to swell

Sponges grow in the ocean. If a live sea sponge is placed into a glass of distilled (100%) water, what will immediately happen? A. water will not move across the sponge's cell membranes B. water will move in and out of the sponge's cells at an equal rate C. water will move out of the sponge's cells causing it to shrink D. water will move into the sponge's cells causing it to swell

cells

The human body is made up of four types of tissues. Which of the following structures make up tissues? A. organs B. cells C. systems D. organelles

bacteria, daily life, decomposition of waste products, metabolizing, protective microflora, benefical

The majority of _______________________________________ found in _________________________ environments are involved in many processes, including the ___________________________________ of other organisms, ________________________________________ food, and functioning as __________________________________________ in human bodies. This is strong evidence that bacteria are ____________________________ to humans.

bacteria.

The most numerous organisms on Earth are: A. insects. B. plants. C. bacteria. D. fungi.

diffusion

What cellular process causes the movement of the oxygen into the cells from the blood? A. active transport B. osmosis C. diffusion D. exocytosis

a cell

What is the smallest unit of an organism that is classified as living? A. an atom B. a molecule C. an organ D. a cell

The flower will shrivel and die.

What will happen to a fresh cut flower when it is placed in a salt water solution? A. The flower will stay fresh for 2 to 3 days. B. The leaves will turn different colors. C. The flower will shrivel and die. D. The flower petals will swell up.

Water molecules diffuse from areas of high concentration to areas of low concentration.

When a plant cell is placed in distilled water, water molecules move into the cell. When a plant cell is placed in salt water, it loses water to the surrounding solution. Why does this occur? A. The water molecules are moving from an area of low concentration to an area of high concentration. B. Water molecules diffuse from areas of high concentration to areas of low concentration. C. The movement of water is associated with the temperature of the water. D. The salt eats away at the cell membrane and causes it to collapse.

prokaryote: flagella, circular DNA, plasma membrane, ribosomes eukaryote: flagella, mitochondria, plasma membrane, ribosomes

When looking at cells, scientists divide them into two major categories, prokaryote and eukaryote. Each of them needs to be able to grow, reproduce and survive in a variety of environments. Match the correct cell type to the components listed. The components can be used more than once if they are found in both prokaryotes and eukaryotes or may only be used once if found in only one of the cell types.

All organisms are made of cells.

Which characteristic do all organisms share? A. All organisms are made of cells. B. All organisms have cells with cell walls. C. All organisms can make their own food. D. All organisms have cells with a nucleus.

cone

Which is not a common shape for prokaryotic cells? A. cone B. round C. spiral D. rod

archaea

Which kingdom of organisms was once classified as bacteria but was later found to have characteristics very different from most bacteria? A. archaea B. algae C. protozoa D. fungi

Substances move from greater to lesser concentration.

Which of the following describes the way substances diffuse in and out of a cell? A. Substances move from greater to lesser concentration. B. Substances move from lesser to greater concentration. C. Substances move back and forth across the membrane equally. D. Substances move across the membrane when energy is available.

bacterial cell

Which of the following is a prokaryotic cell? A. paramecium B. amoeba C. bacterial cell D. plant cell

All organisms are made up of cells.

Which of the following is the characteristic that all organisms have in common? A. All organisms are made up of cells. B. All organisms are multicellular. C. All organisms can make their own food. D. All organisms have cells with a nucleus.

Prokaryotes can be harmful or helpful to humans.

Which of the following is true? A. Prokaryotes are always harmful to humans. B. Prokaryotes are always helpful to humans. C. Prokaryotes can be harmful or helpful to humans. D. Prokaryotes have no effect on humans.

They all have a cell membrane.

Which of the following statements is true about all cells? A. They are all part of tissues. B. They all contain chlorophyll. C. They all have a cell wall. D. They all have a cell membrane.

All cells come from other cells.

Which of the following statements is true about cells? A. All things are composed of cells. B. All cells have a nucleus. C. All cells come from other cells. D. All cells are microscopic in size.

They are usually helpful and sometimes harmful to humans.

Which of the following statements is true of bacteria? A. They are always helpful to humans. B. They are always harmful to humans. C. They are usually helpful and sometimes harmful to humans. D. They are usually harmful and sometimes helpful to humans.

All organisms are made of one or more cells.

Which part of the cell theory did Schleiden help establish with his observation of plant material? A. Cells were named by Robert Hooke. B. Nonliving things are made up of cells. C. All cells come from existing cells. D. All organisms are made of one or more cells.

Most bacteria are not harmful to humans.

Which statement about bacteria is true? A. Bacteria cells have nuclei. B. Bacteria are multicellular organisms. C. Bacteria are a type of fungus. D. Most bacteria are not harmful to humans.

prokaryote, eukaryote, both cell types, eukaryote, prokaryote, both, both

While __________________________ cells are more simple than __________________________ cells, each of them have important functions in our world. ___________________________ use energy in order to grow. Inside __________________________ cells are multiple chromosomes and __________________________ cells have one very long circular DNA. They use these to carry the genetic information to the next generation. __________________________ cells help us to make food such as cheese and bread. But unfortunately, __________________________ cells can also make humans sick.