Cells and Plasma Membrane Unit 2

A cell cycle "checkpoint" would be best described as: A. a site in the cytoplasm where proteins are inspected for mutations. B. either G1, S, G2, prophase, metaphase, anaphase or telophase. C. specific stages where further progress of the cell cycle can be halted. D. any step where the cell cycle is blocked by a mutated protein.

C

Early elements of the cell theory followed soon after the development of Hooke's light microscope. What does this relationship suggest about the evolution of cell theory since Hooke? A) Improvements in technology are closely related to changes in the cell theory B) Isolated scientists contributed pieces of the cell theory to form the whole C) Progress on the cell theory was delayed by a lack of technological progress D) Scientists needed to focus less on cells and more on microscope development

A

The sodium potassium ion pump found in some cell membrane is made of which of the following basic structural components A. Amino Acids B Fatty Acids C Monosaccharides D Nucleotides

A

Which of the following best compares the processes of mitosis and meiosis? A) Mitosis involves one division cycle and results in diploid daughter cells, while meiosis consists of two division cycles and results in haploid gametes B) Mitosis involves one division cycle and results in haploid gametes, while meiosis consists of two division cycles and results in diploid gametes C) Mitosis involves two division cycles and results in diploid daughter cells, while meiosis consists of one division cycle and results in haploid gametes D) Mitosis involves two division cycles and results in haploid gametes, while meiosis consists of one division cycle and results in haploid gametes

A

Which of the following best summarizes why the technological invention of microscopes was important to biology? A) It allowed for development of the cell theory B) It created a means of funding for cell research C) It created public interest and support for research D) It gave scientific credibility to those working on cell theory

A

What is the primary function of the cell membrane A Determining genetic traits B Defending against foreign particles C breaking down proteins for energy D generating energy from mineral nutrients

B

Which statement best compares a eukaryote and a prokaryote? A) Eukryotes have a cell wall, while prokaryotes have a cell membrane B) Eukaryotes have membrane-bound organelles, while prokaryotes have few specialized structures C) Eukaryotes use active transport to move substances across the cell membrane, while prokaryotes use facilitated diffusion D) Eukaryotes use flagella to move themselves through substances, while prokaryotes are not able to move

B

Which of the following best explains why meiosis results in greater genetic diversity than mitosis? A) After meiosis, daughter cells are diploid and have twice as much genetic material, which can be divided in many more possible combinations B) After meiosis, haploid daughter cells are fertilized, which doubles their number of chromosomes and increases the number of possible genes C) During meiosis, chromosomes assort themselves independently of each other, which allows for more different possible combinations of chromosomes D) During meiosis, more daughter cells are produced, which increases the likelihood that fertilization will occur

C

Which of the following characteristics defines a cell as a eukaryote? A) Being able to move B) Being able to reproduce C) Having a nucleus D) Having ribosomes

C

Why does the study of cell membranes lead to a better understanding of cell function A All cell functions occur in the cell membrane B all energy transfers occur at the cell membrane C all cell membranes contain the information for making proteins D All materials needed for cell functions must pass through the cell membrane.

D

Mistakes in the process of mitosis may result in _____.? a) the duplication of chromosomes in cells b) the partial distribution of chromosomes c) the destruction of surrounding cells D) all of these

D all of these

An osmosis investigation was conducted using chicken egg to represent cells with semipermeable membranes. The mass of each egg was measured to determine how much water diffused into or out of the effs. The eggs were first soaked in vinegar to dissolve the shell. Each egg was then placed in one of three different solutions for 24 hours. Based on this experiment, which of the following should be inferred about cells with semipermeable membranes?

Water enters the cell when placed in environments of high water concentration