Question

1. the diagram represents the movement of three different substances across a cell membrane. moving which of these substances across the cell membrane requires energy from atp? a. 2 only b. 3 only c. 1 and 2 d. 1 and 3 10. a student observed a human cheek cell under a light microscope and made these observations: - the chromatin is condensed. - there is no visible nucleolus. - the spindle fibers are visible. - the nuclear membrane looks like it is disappearing. which phase of the cell cycle is this student most likely observing? a. prophase b. metaphase c. telophase d. interphase 11. which statement accurately compares eukaryotic cells and prokaryotic cells? a. eukaryotic cells are more complex than prokaryotic cells. b. eukaryotic cells replicate faster than prokaryotic cells. c. only prokaryotic cells have membrane - bound organelles. d. only prokaryotic cells lack outer membranes and cell walls. 12. which table correctly identifies organelles found in plant cells and in animal cells? a. organelle present in animal cells present in plant cells nucleus x x mitochondrion x x chloroplast - x cell wall - x b. organelle present in animal cells present in plant cells nucleus x x mitochondrion x x chloroplast x - cell wall - x c. organelle present in animal cells present in plant cells nucleus x x mitochondrion x x chloroplast - x cell wall x - d. organelle present in animal cells present in plant cells nucleus x x mitochondrion x x chloroplast - x cell wall - x 13. a student claims that the influenza virus replicates in the air and then infects people. which statement best describes the claim? a. the claim is true because viruses can infect cells without direct contact. b. the claim is true because viruses replicate within the particles of the air. c. the claim is false because viruses require host cells in order to replicate. d. the claim is false because viruses cannot survive in the air.

Explanation:

9.

Step1: Identify active transport

Active transport moves substances against the concentration gradient and requires ATP. Substance 2 is moving from an area of low concentration to high concentration.

Step2: Determine the answer

Since only substance 2 is moving against the concentration - gradient and requires ATP for this movement, the answer is A.

Step1: Analyze cell - cycle phases

In prophase, chromatin condenses, the nucleolus disappears, and the nuclear membrane starts to break down. These are the observations made by the student.

Step2: Determine the phase

Based on the above - mentioned characteristics, the cell is in prophase.

Step1: Recall cell - type characteristics

Eukaryotic cells have a nucleus and membrane - bound organelles, and are more complex than prokaryotic cells which lack a nucleus and most membrane - bound organelles.

Step2: Evaluate options

Option A is correct as eukaryotic cells are more complex. Prokaryotic cells generally replicate faster (so B is wrong), eukaryotic cells have membrane - bound organelles (so C is wrong), and many prokaryotic cells have outer membranes and cell walls (so D is wrong).

Answer:

A. 2 only

10.