I need some help with these questions. I've chosen answers, but I want to make sure if they are correct.
1)Which of the following is an acidic pH?
6
7
8
800
A: 6
None of the above
-------------------------------------
2) Which of the following is directly produced by photosynthesis?
Glucose and oxygen
Carbon dioxide and water
Oxygen and water
Glucose and carbon dioxide
Energy in the form of ATP
A: Glucose and Oxygen
-------------------------------------
3) A bacterium lacks which of the following structures or components?
Plasma membrane
Cell wall
Ribosomes
DNA
Nucleus
A: Nucleus
---------------------------------------
4) The plasma membrane is made up of which of the following?
Protein only
Protein and RNA
Phospholipids only
Phospholipids and proteins
DNA only
A: Phospholipids and Proteins
---------------------------------------
5) Which statement about linkage of genes is false?
Genes on the same chromosome are said to be linked
Genes on the same chromosome assort independently
Crossing over between two linked genes can alter phenotypes of progeny
Crossing over results in recombinant phenotypes
Genes on the same chromosome that are far apart have a higher recombination frequency than those that are close together
A: Genes on the same chromosome assort independently
---------------------------------------
6) Genes located on mitochondrial DNA are usually inherited
randomly.
from the mother.
from the father.
evenly from both the mother and the father.
by independent assortment.
A: from the mother
--------------------------------------
7) Which component is required for the initiation of transcription?
The start codon AUG
Promoter DNA sequence
Ribonucleoside triphosphates
Terminator DNA sequence
DNA polymerase
A: Promoter DNA
----------------------------------------
8) Put the following four steps of eukaryotic gene expression in order, from beginning to end.
(1) Pre-mRNA is processed to make mRNA.
(2) Ribosomes translate the mRNA sequence to make proteins.
(3) mRNA is transported to the cytoplasm.
(4) DNA is used as a template to make pre-mRNA.
1; 4; 3; 2
4; 3; 1; 2
4; 1; 3; 2
4; 1; 2; 3
1; 2; 4; 3
A: 4,1,3,2
----------------------------------------
9) RNA polymerases differ from DNA polymerases in that
RNA polymerases do not require a template
RNA polymerases use deoxyribonucleoside triphosphates as substrates
DNA polymerases use ribonucleoside triphosphates as substrates
RNA polymerases are less effective at proofreading than DNA polymerases
Only DNA polymerases are processive
A: RNA polymerases are less effective at proofreading than DNA polymerases
-------------------------------------
10) The site on the chromosome occupied by a gene is called
Allele
Region
Locus
Type
Phenotype
A: Locus
1 answer