Rhodopsin
a. is a pigment.
b. is found in rods.
c. absorbs photons of blue-to-green light.
d. molecules changing shape start transduction.
e. includes all of these descriptions.
Answer: e
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Fossil fuels formed naturally on Earth. Why aren't they thought of as renewable resources?
a. fossil fuels were formed during times when dinosaurs roamed Earth and because dinosaurs are now extinct, they can no longer roam b. fossil fuels take such a long time to form naturally c. fossil fuels do form through processes that still operate currently d. fossil fuels form as a result of asteroid impacts, which do not occur very frequently e. both b and c are reasons fossil fuels are thought of as nonrenewable
Assume that the somatic cells of a male contain one pair of homologous chromosomes (e.g., AaAb) and an additional chromosome without a homolog (e.g., W)
Which chromosomal combinations would be expected in the meiotic products (spermatids) of a single primary spermatocyte? (There may be more than one answer.)
If Hershey and Chase had used radioactive oxygen in their experiments instead of phosphorus and sulfur, what results would they have likely obtained?
A) They would have observed a radioactive signal in the pellet only. B) They would have observed a radioactive signal in the liquid only. C) They would have observed a radioactive signal in both the pellet and the liquid. D) They would have not observed radioactivity anywhere.
Match the letter of each example from childbirth to the appropriate component of a positive feedback loop.A. Pituitary gland secretes oxytocin, which acts on the uterusB. Uterine contractions increaseC. Fetus is pushed against uterine openingD. Receptors detect stretchE. Brain receives and compares stretch informationResponse
What will be an ideal response?