Cell Biology Answers

What are respirasomes? What is their function?

9+2 structure in fibres is common in certain?
a.cilia b.flagella c. eukaryotes d.bacteria e. all

What is isotonic and isometric contraction?

) Arrangement of steps of DNa replication in order wise. is this correct


1.- Helicase unwinds the DNA double helix

2.- single stranded DNA binding proteins bind to each template strand.

3.- RNA primers are added.

4.- DNA polymerase synthesizes DNA.

5.- RNA primers are removed.

6.- DNA ligase joins DNA fragments together.

What strategies do cells use to ensure that newly replicated DNA does not contain errors? (more than one answer)

DNA polymerase replaces the newly replicated DNA on any chromosomes on which there are mistakes.

Enzymes proofread the DNA after the DNA has been replicated and replace any mismatched nucleotides.

Enzymes repair mistakes in the new DNA double helix after the new double helix separates from the original double helix.

As DNA polymerase synthesizes new DNA, the DNA polymerase finds and corrects misplaced nucleotides

Enzymes remove and resynthesize any misshapen sequences in the DNA prior to replication.

I believe the answer would be these choices - I they correct would their be any others

As DNA polymerase synthesizes new DNA, the DNA polymerase finds and corrects misplaced nucleotide.

Enzymes proofread the DNA after the DNA has been replicated and replace any mismatched nucleotide.

How does the structure of DNA encode genetic information?
the sequence of amino acids
the sequence of bases
the structure of the bases
the length of the DNA molecule

What is the key feature of DNA that allows it to be copied?
the arrangement of chromosomes
the sugar phosphate backbone
complementary base pairing
Okazaki fragments

Would the following answers be correct

Which of the following are products of cell division by mitosis? **Answer C**
A. cells that have different forms of the same gene
B. four genetically similar daughter cells
C.two cells genetically identical to the original cell**
D. daughter cells with half the number of chromosomes

Which of the following are true of endosymbiotic theory? **Answer A B C**
A. Explains the origin of some eukaryotic organelles , such as chloroplasts
B. explains why mitochondria contain a double membrane
c. states that an ancestral eukaryotic cell engulfed an aerobic proteobacteria
D. explains the origin of all organelles found within a eukaryotic cell
E provide insight about why mitochondria can survive outside of a eukaryotic cell

I'm in need of an explanation for zig-zag or two start model of chromatin packaging. Can you provide some help.

Thank you.

Most Archaeans lack a peptidoglycan what

select the descriptions that apply to the sodium potassium pump
adenosine triphosphate is necessary for the pump’s function
the pump moves potassium ions into the cell and sodium out of the cell
sodium ions and potassium ions move into and out of the plasma membrane by osmosis
the concentration gradient of the ions determines the direction of movement through the pump