Test 4 Flashcards
A photosystem consists of chlorophyll,
Electron acceptor, and other light gathering molecules like carotene
Which color of light has the longest wavelength?
Red
What two chemicals are produced by non-cyclic electron flow?
ATP and NADPH
What is the function of an electron acceptor molecule?
It holds high energy electrons to stop them from wasting the energy as heat
Give an example of a CAM plant
Cactus
Which two cancers below have a low genetic risk?
Lung and uterus
Roughly how many genetic combinations in humans are caused by independent assortment of chromosomes alone?
8 million
What molecule in the nucleus controls the copying of DNA?
Cyclin
During which stage in meiosis is the chromosome number halved?
Anaphase I
What chemical do plants absorb through the roots to allow them to make proteins?
Nitrate
Normal cells will only divide by mitosis if
The correct growth factor is present and each cell is not completely surrounded by other cells
What stage in mitosis has two groups of chromosomes moving apart towards opposite ends of the cell?
Telophase
What type of cancer has an annual death rate of 57,000 and is the second biggest killer in terms of cancer in the US?
Colon
What type of gene prevents mitosis, or makes cancer cells commit suicide?
Tumor suppressor genes
Roughly when did Gregor Mendel conduct most of his work?
1860
If two heterozygous individuals are crossed in a situation of incomplete dominance, the expected ratio of phenotypes in the offspring is
1:2:1
A test cross always crosses the unknown with a
Homozygous recessive
What is meant by heterotroph?
Take in organic molecules ready made
C4 plants can store carbon dioxide as molecules of
Oxaloacetate
Give an example of polygenic inheritance
Average sized parents can have a very tall child
If a human cell with 46 chromosomes undergoes mitosis, this will produce two cells, each with
46 chromosomes
What is a proto-onco gene?
It starts mitosis
If a gene has a different effect depending on whether it came from your mother or your father, this is called
Imprinting
What are Barr bodies?
An inactive X chromosome in females
How much of a chromosome is genes?
10%
