biology

Which of the following is an example of a characteristic of life?

All of the answer choices are correct.

The three domains in the Woese classification system are

Archaea, Bacteria, and Eukarya

Until the late 1970s, there was no "Domain" as the broadest category in taxonomy. Instead, there were five kingdoms: Protista, Plantae, Fungi, Animalia, and Monera, which included all bacteria-like organisms. Researchers proposed the domains to distinguish between the bacteria-like organisms. Which information supported placing bacteria and archaea in separate domains?

Differences in DNA among the existing kingdoms showed a need for a broader naming category.

Which of the following is not true about a hypothesis?

It can be proven to be true.

Which of the following is not a true statement about the scientific method?

It does not applyto problems encountered in everyday life.

Which of the following is not a description of the cell membrane?

It is a rigid structure.

The four kingdoms included in the domain Eukarya are

Protista, Fungi,Plantae, and Animalia

Examine this diagram. Note the structure of branches connecting groups of organisms. Called a phylogenetic tree, the branches propose relationships among organisms to each other, related to common ancestors. Although the proposed relationships can be described in sentences, the diagram summarizes them visually. Which of the following statements is true based on this diagram?

The organisms in domain Archaea are more closely related to the organisms in domain Eukarya than those in domain Bacteria.

A cytoskeleton is

a structure that aids in the process of cell division.

How do vesicles carrying proteins destined for secretion move to the plasma membrane?

along microtubules

The correct sequence going from smallest to largest is

atom - molecule -organelle - cell - tissue

Domain Eukarya is the most diverse of the three domains. This domain includes all of the following except

bacteria.

Which are recycling centers for the cell?

central vacuole and lysosome

An organelle found in plant cells and some members of the kingdom Protista but not in animal cells is a

chloroplast.

Homeostasis means that

conditions inside a cell or organism remain within a constant range.

A major difference between prokaryotes and eukaryotes is that whereas prokaryotes

do not have a nucleus, eukaryotes have a nucleus in their cells.

A prokaryotic cell

does not have a nucleus.

The smallest scale of biological organization is represented by organelles.

false

A eukaryotic cell

has membrane-bounded organelles.

A theory differs from a hypothesis in that a theory

has more supportive research evidence than a hypothesis

Cells need increased surface area for diffusion of nutrients and wastes. Cells increase their surface area by

having microscopic extensions of the cell membrane.

When phospholipids are mixed with water their ____ interact with water and their ____ are repelled by water, forming a lipid bilayer.

hydrophilic heads; hydrophobic tails

A phospholipid molecule has

hydrophobic tails that are attracted to water.

In an experimental procedure, the researcher has established multiple levels of a chemical, or amounts of light, or some other factor at the beginning of the experiment, in order to determine if and how much the biological system responds. The manipulated factor at varying levels is the

independent variable.

The Golgi apparatus is not

involved with secretion of cellular substances.

You are feeling ill, so you visit a physician. The physician takes your temperature, blood pressure, and pulse and orders blood tests and urine analysis to determine more about your condition. The results of all of these observations and tests will help the physician assess why your body is temporarily out of "normal" conditions, or when the body is not adequately

maintaining homeostasis.

The most prominent organelle visible in most eukaryotic cells is the

nucleus.

A structure, such as a flower in plants, or a liver in animals, consisting of tissues organized to carry out a specific function is a(n)

organ

The primary structural molecule composing a cell membrane is a(n)

phospholipid

Between the specialized functions of the rough and smooth endoplasmic reticulum, neither have the ability to

produce mRNA.

A central vacuole of a mature plant cell

produces turgor pressure

The function of the nucleolus is

the assembly of ribosome components.

An ecosystem would include all of the following except

the biosphere,with its resources and functioning systems.

In most mammals the DNA found in mitochondria is inherited from

the mother only.

In a class field trip, you scrape what looks like an organism off of a stream rock. Through the semester, with chemical analysis and electron microscopes, you determine that the cell has DNA, RNA, ribosomes, a cell membrane, and cytoplasm. This helps you determine that

this organism you collected is in the Eukarya domain.

An understanding of cellular biology is helping us find new treatments for many diseases.

true

Flagella move by way of dynein proteins that connect microtubules and force them to shift back and forth to bend or rotate the flagella.

true

The cell is the basic unit of life.

true

The organelles mitochondria and chloroplasts contain their own DNA and ribosomes.

true