Which of the following is true of deuterostomes?
a. The first opening into the embryo becomes the
anus.
b. The first opening into the embryo becomes the
mouth.
c. The second opening into the embryo becomes
the anus.
d. The second opening into the embryo becomes
the mouth.
e. Both a and d are true.
Answer: e
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Mordants increase the binding between a stain and specimen.
Answer the following statement true (T) or false (F)
The tropical rain forest biome is characterized by:
a. high density of plants, but nutrient poor soil. b. high density of plants and nutrient rich soil. c. low density of plants due to nutrient poor soil. d. low density of plants, yet nutrient rich soil. e. intermediate density of plants and intermediate nutrient supply.
What is a reflex action? Make a labeled sketch of the spinal cord and related structures that describes the functioning
of the withdrawal reflex. What will be an ideal response?
Traits that are determined by a single gene:
a. are common in humans. b. occur in single-celled organisms, but not in humans. c. must occur on the X chromosome because males have only a single X, so the gene must be able to function in the absence of its homologous allele. d. include eye color and skin color. e. can have only two alleles.