Which of the following contributed to the dust bowl in the American southwest during
the
1930s?
I) overgrazing by cattle
II) clear-cutting of forest trees
III) plowing of native grasses
IV) lack of soil moisture
A) I and II
B) I, III, and IV
C) I, II, III, IV
D) II, III, and IV
Give this one a try later!
B) I, III, and IV
,Totipotency is a term used to describe a cell's ability to give rise to a complete new
organism. In
plants, this means that _____.
A) the cells of shoots and the cells of roots have different genes
B) cell differentiation depends largely on the control of gene expression
C) a cell's environment has no effect on its differentiation
D) plant development is not under genetic control
Give this one a try later!
C) a cell's environment has no effect on its differentiation
How would you expect the root system of a plant grown by hydroponics to compare
to the root
system of a plant grown in soil? The root system of a plant grown by hydroponics
would be
_____.
A) about the same
B) more developed
C) absent
D) less developed
Give this one a try later!
D) less developed
Food moves along the digestive tract as the result of contractions by _____.
A) skeletal muscle
B) cardiac muscle
C) smooth muscle
D) striated muscle
,Give this one a try later!
C) smooth muscle
Which of the following is the most likely explanation for hypothyroidism in a patient
whose iodine level is normal?
A) hyposecretion of thyroid-stimulating hormone (TSH)
B) greater production of T3 than of T4
C) hypersecretion of thyroid-stimulating hormone (TSH)
D) a decrease in the thyroid secretion of calcitonin
Give this one a try later!
C) hypersecretion of thyroid-stimulating hormone (TSH)
The egg of a plant has a haploid chromosome number of 12 (n = 12). What is true about
the
number of chromosomes in the cells of other tissues of this plant?
A) The leaves and stems have 12 chromosomes.
B) The zygote has 12 chromosomes.
C) The sperm has 6 chromosomes.
D) The endosperm has 36 chromosomes.
Give this one a try later!
D) The endosperm has 36 chromosomes
Naturally acquired passive immunity can result from the _____.
A) absorption of pathogens through mucous membranes
, B) ingestion of interferon
C) placental transfer of antibodies
D) injection of vaccine
Give this one a try later!
C) placental transfer of antibodies
A cluster of tumor cells that produces and secretes growth factors to induce
surrounding cells to
grow and divide is showing which type of cell-to-cell signaling?
A) paracrine
B) autocrine
C) neuroendocrine
D) endocrine
Give this one a try later!
A) paracrine
What is the advantage of having small, needlelike leaves?
A) increased transpiration rate
B) decreased transpiration rate
C) decreased efficiency of light capture D) increased efficiency of light capture
Give this one a try later!
B) decreased transpiration rate
the
1930s?
I) overgrazing by cattle
II) clear-cutting of forest trees
III) plowing of native grasses
IV) lack of soil moisture
A) I and II
B) I, III, and IV
C) I, II, III, IV
D) II, III, and IV
Give this one a try later!
B) I, III, and IV
,Totipotency is a term used to describe a cell's ability to give rise to a complete new
organism. In
plants, this means that _____.
A) the cells of shoots and the cells of roots have different genes
B) cell differentiation depends largely on the control of gene expression
C) a cell's environment has no effect on its differentiation
D) plant development is not under genetic control
Give this one a try later!
C) a cell's environment has no effect on its differentiation
How would you expect the root system of a plant grown by hydroponics to compare
to the root
system of a plant grown in soil? The root system of a plant grown by hydroponics
would be
_____.
A) about the same
B) more developed
C) absent
D) less developed
Give this one a try later!
D) less developed
Food moves along the digestive tract as the result of contractions by _____.
A) skeletal muscle
B) cardiac muscle
C) smooth muscle
D) striated muscle
,Give this one a try later!
C) smooth muscle
Which of the following is the most likely explanation for hypothyroidism in a patient
whose iodine level is normal?
A) hyposecretion of thyroid-stimulating hormone (TSH)
B) greater production of T3 than of T4
C) hypersecretion of thyroid-stimulating hormone (TSH)
D) a decrease in the thyroid secretion of calcitonin
Give this one a try later!
C) hypersecretion of thyroid-stimulating hormone (TSH)
The egg of a plant has a haploid chromosome number of 12 (n = 12). What is true about
the
number of chromosomes in the cells of other tissues of this plant?
A) The leaves and stems have 12 chromosomes.
B) The zygote has 12 chromosomes.
C) The sperm has 6 chromosomes.
D) The endosperm has 36 chromosomes.
Give this one a try later!
D) The endosperm has 36 chromosomes
Naturally acquired passive immunity can result from the _____.
A) absorption of pathogens through mucous membranes
, B) ingestion of interferon
C) placental transfer of antibodies
D) injection of vaccine
Give this one a try later!
C) placental transfer of antibodies
A cluster of tumor cells that produces and secretes growth factors to induce
surrounding cells to
grow and divide is showing which type of cell-to-cell signaling?
A) paracrine
B) autocrine
C) neuroendocrine
D) endocrine
Give this one a try later!
A) paracrine
What is the advantage of having small, needlelike leaves?
A) increased transpiration rate
B) decreased transpiration rate
C) decreased efficiency of light capture D) increased efficiency of light capture
Give this one a try later!
B) decreased transpiration rate
