The cheesy coating that prevents the fetus' skin from chafing is called
a. vernix caseosa.
b. fossa ovalis.
c. chorionic villus.
d. lanugo.
e. colostrum.
A
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Consider Mendel's experiments involving the trait of round versus wrinkled peas
In some experiments, Mendel's method involved removing the anthers that produce pollen from the flowers of the round peas and applying pollen from the anthers of the wrinkled plant. What would have happened if Mendel had missed some anthers he was trying to remove from the flowers of the plants that produce only round peas, and observed the peas produced by a plant that had a mix of round and wrinkled pollen? (Indicate which of the following MUST be true.) Comments: This problem is more complicated that it might appear at first. For example, if the parent with some of its own anthers and some introduced pollen has a phenotype that results from a homozygous dominant genotype, the F1 would all appear to have the dominant phenotype even if some recessive pollen grains were introduced. However, if the parent had a recessive phenotype and mixed pollen, the results would differ. Remember, the 9:3:3:1 ratio is when two different genes are involved. A. The F1 peas produced would have mixed phenotypes. B. The F1 peas produced would have a single phenotype. C. The F2 peas would have phenotypes in a 9:3:3:1 ratio. D. The F2 peas would all have the phenotype of the parental plant with the anthers not properly removed. E. The F1 peas would have phenotypes in a 1:1 ratio.
Carbohydrate molecules:a
serve as structural components of human cell walls. b. form the regulatory compounds known as enzymes. c. are a source of energy. d. help protect vital organs from damage. e. contain the genetic information of a cell.
Humans who have mutations in the presenilin genes are at a higher risk for developing early-onset Alzheimer's disease
The human presenilin proteins that are made from these genes are responsible for altering other proteins by cleaving (cutting) them at specific positions. Presenilin proteins that are highly similar to the human ones have been identified in C. elegans, a microscopic nematode worm. These nematodes do not get Alzheimer's disease, as they do not have a brain. What would you expect the function of nematode presenilins to be? A) They are responsible for the development of the central nervous system. B) They are responsible for altering other proteins by cleaving them. C) They are responsible for transporting proteins to a new location within cells. D) They are responsible for the synthesis of new proteins.
Organic molecules make up what percentage of the dry weight of a plant?
a) 96% b) 6% c) 67% d) 81% e) 17%