What was the climate like during the Cenozoic era after dinosaurs went extinct and mammals began to diversify?
A. It was cooling off, with glaciers forming.
B. It was becoming hot and dry, with great desert expansion.
C. It stayed the same as in the Paleozoic era.
D. It was becoming warmer and subtropically moist.
Answer: A
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Why is it a good idea for a bacterial cell to be able to utilize glucose FIRST as an energy source (until it's used up), THEN switch to lactose?
A. Glucose is an easier compound to break down and obtain energy from than lactose. B. Lactose cannot be used by bacterial cells as an energy source. C. It's about conservation of energy-why expend the energy to make the extra enzymes for breaking down lactose when glucose is right there and doesn't need the extra enzymes for breakdown. D. Glucose provides 10x as much energy when broken down as lactose. E. Glucose is no easier compound to break down and obtain energy from than lactose AND It's about conservation of energy-why expend the energy to make the extra enzymes for breaking down lactose when glucose is right there and doesn't need the extra enzymes for breakdown.
An embryo sporophyte surrounded by nutritive tissue and then a tough, protective outer coat makes up
a(n) ____ that shelters the embryo from drought, cold, and other adverse conditions.
a. pollen grain b. spore c. ovule d. seed e. strobilus
________ in Drosophila results from the movement of the transcriptionally active w+ allele into the centromeric heterochromatin region of the fruit-fly X chromosome
Fill in the blank(s) with correct word
What is the site of protein synthesis in the cell?
A) Smooth endoplasmic reticulum B) Ribosome C) Nucleolus D) Nucleus E) Eukaryotic chromosome