The structure that easily distinguishes a plant cell from an animal cell is

A. chloroplasts.
B. the Golgi apparatus.
C. the nucleus.
D.  the plasma membrane
E. mitochondria.


Answer: A

Biology & Microbiology

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Aldosterone is a hormone secreted by the adrenal cortex, and insulin is a peptide secreted by the pancreas

When aldosterone contacts a target cell, it binds to an intracellular receptor and migrates to the nucleus; insulin binds to extracellular receptors on the plasma membrane. What is the most likely reason for this difference? A. Aldosterone is hydrophilic and therefore must enter the aqueous environment of the cytoplasm to have an effect. B. Aldosterone is lipid-soluble and therefore easily crosses the phospholipid bilayer of the plasma membrane. C. Aldosterone is too small to bind extracellular receptors on the plasma membrane. D. Insulin is too large to interact with DNA.

Biology & Microbiology

Plants living in standing water often face which of the following problems?

A. Increased CO2 levels B. Loss of stomata C. Harmful root pressure D. Oxygen deprivation E. Chilling of the roots

Biology & Microbiology

Gene therapy has not yet cured any patient of his or her genetic disorder

a. True b. False

Biology & Microbiology

Garlic contains an antimicrobial substance called (acetic acid/allicin/benzoic acid)

What will be an ideal response?

Biology & Microbiology