Parietal cells secrete:a
chyme.
b. pepsin.
c. pepsinogen
d. HCl and instrinsic factor.
e. mucus.
D
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Why is it essential that meiosis produce haploid cells?
A. so that the number of chromosomes will double each generation B. to produce haploid offspring C. to prevent the number of chromosomes from doubling each generation D. to produce diploid gametes E. to allow asexual reproduction
The presence of a cell (slime layer/wall/membrane) enables bacterial and plant cells to resist the effects of hypotonic solutions.
Fill in the blank(s) with the appropriate word(s).
What can you conclude from the fact that DNA analysis of all chloroplasts reveals that they are monophyletic?
A. Endosymbiosis of the same species of cyanobacteria occurred multiple times in cells that evolved into red, green, and brown algae. B. All eukaryotic cells engulfed cyanobacteria at some point in their evolutionary history. C. Aerobic bacteria were engulfed by eukaryotic cells, forming plant cells. D. Cyanobacteria reproduced by sexual reproduction after being engulfed by brown algae.
Losing a pound of fat requires expending about
a. 1500 kcal. b. 2000 kcal. c. 2500 kcal. d. 3000 kcal. e. 3500 kcal.