Viruses are considered to be __________ because they ____________________ .

non-living; require a host cell to reproduce

non-living, do not contain genetic material

living; do not require a host cell to reproduce

living; contain genetic material

The cellular process known as the sodium-potassium pump was discovered in the 1950s by Jens Christian Skou, a Danish scientist. This process is a form of active transport that moves three sodium ions to the outside of a cell for every two potassium ions that it moves into the cell. Which of these best explains why energy is needed for active transport?

Ions are moved against the concentration gradient.

Ions are attached to large proteins.

Ions are trapped inside the plasma membrane.

In 1898 Friedrich Loeffler and Paul Frosch found evidence that the cause of the highly contagious hoof-and-mouth disease in livestock was a microscopic infectious particle. It was discovered that this particle requires a host cell to reproduce.Which pathogen is most likely responsible for causing hoof-and-mouth disease in livestock?

A virus, because it requires a host cell to reproduce

A bacterium, because it is contagious

A fungus, because it infects livestock

A protist, because it is microscopic

Viruses can be transmitted through air, water, food, insect bites, and direct skin contact. Once a virus gains entry to the body, it invades a host cell in order to —

access cellular processes for replication.

deactivate the host cell's defenses.

synthesize antibodies for defense.

metabolize host proteins and frow.

Which choice describes two steps of DNA replication?

Step 1: DNA polymerase matches adenine to thymine and guanine to cytosine. Step 2: Two identical DNA helixes are produced.

Step 1: DNA polymerase matches uracil to thymine and guanine to cytosine. Step 2: Two identical DNA helixes are produced.

Step 1: DNA polymerase matches cytosine to thymine and guanine to cytosine. Step 2: Two separate but complementary single DNA strands are produced.

Step 1: DNA polymerase matches uracil to thymine and guanine to cytosine. Step 2: Two separate but complementary single DNA strands are produced.

Scientists determined the total mass of DNA from a sample of animal cells. The masses of equal numbers of cells were taken during three different stages of the cell cycle. Stage I contains cells massed during G 1 of the cell cycle. Which statement best describes the cells during Stage II?

The cells have replicated their DNA and completed mitosis and cytokinesis.

The cells have replicated their DNA, but have not completed mitosis and cytokinesis.

The cells have completed mitosis and cytokinesis without replicating their DNA.

The cell have temporarily exited the cell cycle without replicating their DNA.

The life cycle of a frog is illustrated in the diagram. Which statement best explains how the cell cycle is important to the life cycle of the frog?

In allows frogs to grow, develop, and reproduce.

It enables frogs to produce tadpoles that are clones.

It prevents overproduction of frog offspring.

It ensures the best adapted frogs survive and pass on traits to offspring.

From a single fertilized ovum undergoing a series of rapid cell divisions, a human infant develops. The embryonic cells become specialized for a variety of functions. Which of these statements best describes how different cell types develop?

Each cell has an identical copy of DNA with enzymes controlling the expression of specific genes, leading to a variety of cells.

Each cell type contains only the active parts of the DNA needed for that cell type.

Each cell has only one chromosome containing the DNA needed for that cell type.

Each cell has multiple copies of DNA that are affected in different ways by the environment to change the function of the cell at regular intervals.

The diagram below represents the cell cycle. When cells leave the cell cycle, they exit during G 1 phase and then enter G 0 phase, a resting period. Most normal cells can leave G 0 phase and reenter the cell cycle at G 1 phase before entering S phase. Cancer cells are different because they cannot enter G 0 phase and are likely to do which of the following?

Repeat the cell cycle continuously

Lobo Bio RC1

Quiz

•

Biology

•

9th - 12th Grade

•

Practice Problem

•

Medium

•

NGSS

HS-LS1-4, MS-LS1-1, HS-LS1-5

+7

Standards-aligned

Alisa McElroy

Used 18+ times

FREE Resource

35 questions

Show all answers

1.

LABELLING QUESTION

1 min • 1 pt

Identify the type of cell each column represents.

a

b

eukaryote

prokaryote

Rigid stiff outer layer that provides protection and structure

Chloroplasts

Controls what enters and leaves the cell

Cell Membrane

Protein synthesis

Cell Wall

Converts solar energy into glucose

Mitochondria

Converts glucose into ATP

Ribosomes

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Lobo Bio RC1

35 questions

Identify the type of cell each column represents.

Identify the type of cell the pictures represent.

Bacteria have __________ cells.

Animals have __________ cells.

Fungi have __________ cells.

Plants have __________ cells.

Match the following organelles to their statements that best describe them.

The image best represents the __________ theory.

Match the following types of cellular transport to the correct image.

Match the following cellular transports to the correct definition.

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