During high tide a plant or animal would be at risk of
A. dehydration by facilitated diffusion of salts.
B. dehydration due to active transport of salts.
C. cells bursting due to active transport of salts.
D. cells bursting by osmosis of water.
E. dehydration by osmosis of water.
E. dehydration by osmosis of water.
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In garden peas, one pair of alleles controls the height
of the plant, and a second pair of alleles controls flower color. The allele for tall (D) is dominant to the allele for dwarf (d), and the allele for purple (P) is dominant to the allele for white (p). A tall plant with purple flowers crossed with a dwarf plant with white flowers produces 1/4 tall purple, 1/4 tall white, 1/4 dwarf purple, and 1/4 dwarf white. What is the genotype of the parents? What will be an ideal response?
Penicillins and cephalosporins
A. damage cell membranes. B. block peptidases that cross-link glycan molecules. C. attach to the 30S ribosomal subunit and disrupt protein synthesis. D. are metabolic analogs of PABA and block folic acid synthesis. E. destroy peptidoglycan.
In humans, how does spermatogenesis differ from oogenesis?
a. Spermatogenesis involves meiosis, while oogenesis involves mitosis. b. Spermatogenesis produces fewer numbers of gametes. c. Spermatogenesis begins at birth, while oogenesis begins at puberty. d. Spermatogenesis continues throughout life, while oogenesis ends at menopause.
Which of the following DNA repair processes is most likely to introduce mutations into the repaired DNA?
A) base-excision repair B) light repair C) single-strand repair D) mismatch repair E) SOS response repair