The dashed line in the accompanying figure represents a(n) ____

a. covalent bond
b. ionic bond
c. hydrogen bond
d. polar covalent bond
e. hydrophobic interaction


ANSWER: c

Biology & Microbiology

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The recognition of a chemical signal by a receptor protein in the membrane is most similar to ____

a. mRNA specifying the sequence of amino acids in a polypeptide b. binding of a specific substrate to the active site of an enzyme c. turning on gene transcription d. allosteric regulation of proteins e. an enzyme requiring a specific optimum pH and temperature for activity

Biology & Microbiology

An unknown organism from an alien planet is observed and found to have a diploid state in every other generation that

results from fertilization. The haploid state is able to grow into a gametophyte-like structure. This alien organism most closely mimics the life cycle strategy of which of the following earth organisms?

a. humpback whale b. chimpanzee c. algae d. bacteria e. all plants and some fungi

Biology & Microbiology

If a cell containing 18 chromosomes divides by meiosis, how many chromosomes will each daughter cell have?

a. 2 b. 9 c. 18 d. 26

Biology & Microbiology

What is the function of the lymphatic system?

A. To aid in the body's defenses. B. To return protein to the circulation. C. To carry bacteria and dead blood cells to the lymph nodes and spleen. D. To transport fats absorbed from the intestine. E. All of the choices are correct.

Biology & Microbiology