Describe the primary membranes surrounding the human fetus
What will be an ideal response?
The chorion contributes to the placenta, and produces human chorionic gonadotropin, which prevents menstruation. The amnion surrounds a fluid-filled cavity that acts as a shock absorber for the developing fetus. The chorion and maternal tissue form the placenta, an exchange site where embryonic blood vessels encounter blood-filled spaces in the uterine lining.
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Which factor is most likely to lead to allopatric speciation within a population of fish in a river? a. The largest males in the population claiming the best nesting sites
b. A new food source becoming available. c. Introduction of a new predator into the river. d. Increase in pesticide use by the surrounding communities. e. A dam being established on the river.
Which alleles are dominant to each other in blood type inheritance?
A) Alleles IA and i are dominant to the allele IB. B) Alleles IB and i are dominant to the allele IA. C) Alleles IA and IB are dominant to the allele i. D) Alleles IA, IB, and i are codominant.
Inhibitory synapses utilize (i) _______ or (ii) ________.
a) (i) GABA, (ii) Glycine b) (i) GABA, (ii) Glutamate c) (i) Serotonin, (ii) Glycine d) (i) Serotonin, (ii) Glutamate
A change in a single amino acid can change the structure and function of an entire protein. However, in some cases, there can be gene mutations, which change an amino acid in a protein structure but do not change either the overall shape or function of a protein. In cases like these, which level(s) of protein structure would change?
A. none B. primary, secondary, tertiary, and quaternary C. secondary and tertiary D. primary