Question

QUESTION 25

1. During the first division of meiosis (meiosis I):

		a. Homologous chromosomes separate
		b. Sister chromatids separate
		c. Four daughter cells are formed
		d. There is no metaphase

2 points   

QUESTION 26

1. Green plants are considered:

		a. Chem-heterotrophs
		b. Photo-autotrophs
		c. Chem-autotrophs
		d. Photo-heterotrophs

2 points   

QUESTION 27

1. Traits like height or intelligence are polygenic. Polygenic means they:

		a. Are influenced by many genes
		b. Have many alleles
		c. Tend to skip a generation
		d. Are very common in a population

2 points   

QUESTION 28

1. Hemophilia type A is caused by a recessive allele. We see the disease phenotype almost exclusively in boys. The gene for this blood clotting factor (factor VIII) is probably:

		a. On the X chromosome
		b. On the Y chromosome
		c. On the Z chromosome
		d. On an autosomal chromosome

2 points   

QUESTION 29

1. Water is less dense as a solid than as a liquid, so ice floats. This unusual phenomenon is caused by:

		a. Covalent bonding between Hydrogen and Oxygen
		b. Hydrogen has the lowest atomic mass of any element
		c. Oxygen has very low electronegativity
		d. Hydrogen bonding between water molecules

2 points   

QUESTION 30

1. A double-blind experiment is when:

		a. The test subjects don’t know what medicine they are getting or why
		b. Neither the researchers nor the doctors know who is getting the placebo
		c. Neither the test subjects nor the doctors giving the drug know who is getting the placebo, only the researchers behind the scenes
		d. The test subjects are kept anonymous by giving them a number

2 points   

QUESTION 31

1. Before meiosis, human cells are:

		a. Haploid
		b. Diploid
		c. Gametes
		d. Protists

2 points   

QUESTION 32

1. Organic molecules always contain:

		a. Phosphate
		b. Nitrogen
		c. Carbon
		d. Oxygen

2 points   

QUESTION 33

1. A recessive disease allele that is found on one of the autosomal chromosomes will affect:

		a. Boys and girls equally
		b. Mostly boys
		c. Mostly girls
		d. Anyone who has at least one parent who is a carrier

QUESTION 35

1. Adult dogs are diploid with 78 chromosomes. After meiosis, how many chromosomes are in each dog egg or sperm cell?

		a. 4
		b. 13
		c. 39
		d. 78

2 points   

QUESTION 36

1. We expect identical twins to have all the same alleles because:

		a. They are formed from one egg fertilized by two sperm
		b. They are formed from two zygotes
		c. They have the same mitochondrial DNA
		d. They are the result of a single zygote that split in two

2 points   

QUESTION 37

1. What is another way to describe an H+ ion?

		a. Neutron
		b. Electron
		c. Positron
		d. Proton

2 points   

QUESTION 38

1. Which is a correct difference between Mitosis and Meiosis?

		a. Mitosis produces 2 daughter cells, meiosis produces 8
		b. DNA synthesis occurs before mitosis, but not meiosis
		c. Chromosomes condense during prophase of mitosis but not prophase I of meiosis
		d. After meiosis, the number of chromosomes is halved, after mitosis the number is the same

2 points   

QUESTION 39

1. For the first billion years of life on earth, only one type of life form is seen in the fossil record:

		a. Prokaryotes
		b. Eukaryotes
		c. Karyotes
		d. Viruses

2 points   

QUESTION 40

1. The monomers that make up an RNA molecule are:

		a. Nano particles
		b. Sugars
		c. Nucleotides
		d. Amino acids

Answer 1

25. sister chromatids seperate

The number of chromosomes becomes haploid in meiosis I, because the actual sister chromatids are not pulled apart by spindle fibers.

26. Photoautotrophs

Photoautotrophs are organisms that can make their own energy using light and carbon dioxide via the process of photosynthesis.

27. Are influenzed by many genes.

A polygenic trait is one whose phenotype is influenced by more than one gene. Traits that display a continuous distribution, such as height or skin color, are polygenic

28. On the X chromosome

Hemophilia A is carried by the X chromosome. It is inherited in an X-linked recessive manner. As such, two hemophilia-carrying X chromosomes must be inherited for the disease to be active in women, but only in one X chromosome for men.

29. Hydrogen bonding between water molecules

Ice floats on water because it is less dense than water. When water freezes into its solid form, its molecules are able to form more stable hydrogen bonds locking them into positions. Because the molecules are not moving, they're not able to form as many hydrogen bonds with other water molecules.