A: not found in
genomes.
B: not
expressed in cells.
C: genes that
produce essential products for the survival of an organism.
D: need to be
induced.
举一反三
- Constitutive genes are() A: genes that<br/>are expressed all the time. B: genes that<br/>are not expressed at all the time. C: genes that<br/>are expressed when needed. D: genes that<br/>are repressed.
- Why are some genes sometimes turned on and other times turned off? () A: Because<br/>sometimes cells are hungry. B: Because<br/>cells need to rest. C: Because only<br/>when the products are needed by cells. D: Because<br/>cells want to use up some products.
- Linked<br/>genes are A: found<br/>on the same chromosome B: found<br/>in the same nucleus C: found<br/>only on sex chromosomes D: joined<br/>by a centromere
- The<br/>integration mechanism of foreign genes in genetically modified crops<br/>are () A: Homologous<br/>recombination B: Site-specific<br/>recombination C: Transposition<br/>recombination D: Heterologous<br/>recombination
- What is a genetically modified organism (GMO)? A: a plant with certain genes removed. B: an organism with an artificially altered genome. C: a hybrid organism. D: any agricultural organism produced by breeding or biotechnology.
内容
- 0
which<br/>is not one of the Biological factors involved in Etiology of Mental Disorders. ( ) A: Stress-related<br/>life event B: brain tumors C: encephalitis D: Inheritance<br/>factor(caused<br/>by genes)
- 1
mutations in genes can<br/>affect () A: Embryonic Development B: Tissue differentiation C: promote disease including<br/>cancer D: Normal life span of an<br/>individual E: All of the above
- 2
Some genes can be expressed in different ways to generate multiple gene products from a single segment of DNA.
- 3
A complete set of genes of a given species<br/>called ( ) A: genome B: gene C: DNA D: chromosome cDNA
- 4
If the magnetic field B through<br/>a loop of wire is increasing, the<br/>induced magnetic field will be A: in<br/>the same direction as B B: in<br/>the opposite direction as B C: perpendicular<br/>to B D: at<br/>an acute angle to B E: there<br/>is no induced magnetic field