FREE AND STUDY GAMES ABOUT CH. 4 HW EXAM

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FREE AND STUDY GAMES ABOUT CH. 4 HW EXAM

QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -37 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: which of the following statements accurately describes a difference between gram positive and gram negative cells?

Answer:

only gram negative cells have lipolysaccharide (LPS) layer Question 2: which transport protein employs transporters that move molecules only in one direction?

Answer:

Uniport and symport

Question 3: which of the following structures is NOT found in all bacteria

Answer:

capsule

Question 4: once equilibrium is reached

Answer:

molecules move, but there is no net movement

Question 5: Tumbles occur when

Answer:

the flagella rotate clockwise Question 6: why are receptors on the cell surface necessary for bacterial movement?

Answer:

the receptors sense the stimulus and send signals to the flagella.Question 7: what is the mechanism of action of penicillin in a prokaryotic cell?

Answer:

Penicillin weakens the cell wall.

Question 8: pentrichous bacteria make a run when?

Answer:

the flagella turn counterclockwise and become bundled.Question 9: which molecule shown in the animation, the square or the circle, is moving against its concentration gradient?

Answer:

both the circle and the square.

Question 10: which of the following regarding active transport is false?

Answer:

it powers the diffusion of water across the cell membrane

Question 11: as bacterium approaches a food source, one would expect

Answer:

runs to become more frequent Question 12: which of the following statements about bacterial flagella is true?

Answer:

can rotate 360°

Question 13: which of the following statements regarding prokaryotic fimbriae is true

Answer:

fimbriae may occur either at the poles of a bacterial cell, or can be evenly distributed over the entire surface.

Question 14: taxis are

Answer:

movement toward or away from a stimulus

Question 15: Prokaryotic cells lack membrane-enclosed organelles

Answer:

all bacteria contain cytoplasm, ribosomes, a plasma membrane, and a nucleoid. Almost all bacteria have cell walls

Question 16: which of these is true regarding plasmids?

Answer:

Prokaryotic plasmids may carry genes that provide antibiotic resistance to the cell.

Question 17: how does water enter and exit a cell?

Answer:

by simple diffusion or by use of integral transport protein

Question 18: which of the following terms refers to a bacterium?

Answer:

positive phototaxis

Question 19: a positively charged sodium ion

Answer:

would require the use of integral protein channels to pass through a cell membrane Question 20: which statement accurately describes the structure of the plasma membrane?

Answer:

the plasma membrane is a phospholipid bilayer with the hydrophilic groups oriented toward the inside and outside of the cell.

Question 21: why is no energy required in passive transport?>

Answer:

the concentration gradient drives the movement Question 22: which of the following statements accurately describes specific bacterial cell walls?

Answer:

In gram negative bacteria, the thin layer of peptidoglycan is surrounded by an external membrane made out of phospholipids (LPS) and proteins

Question 23: which of the following is an example of bacterial motility?

Answer:

a bacterium moving towards a food source.Question 24: which of the following types of bacterial cells would have only a single flagellum?

Answer:

Monotrichous Question 25: which type of active transport protein moves two molecules at the same time?

Answer:

symport

Question 26: which of the following osmosis is true?

Answer:

if a cell is in a hypertonic solution, water leaves the cell in an attempt to balance to concentration of solutes and reach equilibrium.

Question 27: hydrophobic molecules would enter a cell

Answer:

by passive transport directly across the membrane Question 28: what makes phospholipid membranes good at keeping some molecules out, and allowing others to freely pass?

Answer:

they have both hydrophilic and hydrophobic regions