In addition to maintaining a wet environment necessary for survival of the embryo, what other essential characteristic does the amniotic egg possess?
A) low energy/material for the mother to produce
B) a shell that most predators cannot break
C) ability to allow for gas exchange
D) easier fertilization
E) ability to absorb nutrients from the environment
Answer: C
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Neanderthals were members of
a. Australopithecus robustus. b. Homo habilis (early Homo). c. Homo erectus. d. Homo sapiens. e. none of these.
Which of the following molecules is most likely to cross the cell membrane directly by passive diffusion?
A) Na+ B) fructose (a sugar) C) a steroid hormone (a hydrocarbon) D) insulin (a polypeptide) E) fructose and insulin
Gene expression is influenced by many factors. Which of the following is a factor in gene expression?
A.) phenotype B.) pedigree C.) environment D.) karyotype
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?