Smaller teeth and jaws, presence of a chin, thin facial bones, and rounder, higher skull would be a partial description of ____.
A. Australopithecus robustus gher
B. Australopithecus boisei
C. Homo habilis
D. Homo erectus
E. Homo sapiens
Answer: E
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Most mesophilic organisms can grow in a temperature range of
A) 0-15 °C. B) 10-20 °C. C) 20-40 °C. D) 50-65 °C.
There are cases in which a person inherits a very high susceptibility to cancer. A woman who is heterozygous for a mutation in the BRCA1 gene has one functional allele that helps to suppress tumor formation and one nonfunctional allele of the same gene
She has a 50-70% chance of developing breast cancer before age 70. A tumor is likely to form when a cell "loses heterozygosity" at the BRCA1 gene. This will happen if: A. germ cells in the affected individual develop a mutation in the remaining functional allele of BRCA1. B. a somatic mutation in a breast cell inactivates the remaining functional BRCA1 allele. C. a silent mutation occurs in the remaining functional BRCA1 allele.
When planting seeds, why should you plant more seeds than you expect to grow?
a. Animals may eat some seeds. b. Some seeds may not germinate. c. The wind may disperse some seeds to an unsuitable environment. d. all of these
Before leaving on a trip, you give your favorite houseplant a little extra water and a pinch of plant food. Your trip ends up lasting a few days longer than you originally planned, and when you return, you discover that your plant has wilted dramatically. What happened?
a. The extra water caused its cells to swell, bursting its plasma membranes. b. Overwatering your plant deprived it of the electrolytes that plants crave. c. Your plant dried out before you returned, and it suffered from plasmolysis. d. The plant food inverted the concentration gradient in the plant, dehydrating it.