Biology cognito wrong questions

Some portions of DNA do not code for proteins.

How do non-coding parts of DNA affect gene expression?

• non coding parts can switch genes on and off

Cystic fibrosis is a recessive disorder.

State the possible genotypes of the parents of a child with cystic fibrosis.

1. heterozygous

2. homozygous recessive

The response of the skin to cold weather is an involuntary action.

How is an involuntary action different from a voluntary action?

• are automatic

• are faster

• are protective

The man has a very cold shower.

This makes the man shiver.

What causes shivering?

muscle contraction

What are the two main organs that insulin stimulates to absorb glucose from the blood?

1. liver

2. muscles

define sexual reproduction

a mode of reproduction in which new offspring are produced by the fusion of male and female gametes

asexual reproduction

a form of reproduction by which a new offspring are produced by a single parent

define transcription

the process of copying a single gene of DNA to MRNA

where does transcription take place

nucleus

three ways in which mRNA is different to dna

1. mRNA is shorter than DNA

2. mRNA is single-stranded whereas DNA is double-stranded

3. mRNA contains (U) uracil whereas DNA contains (T) thymine

define translation

process by which a ribosome combines amino acids together to form a protein, using the ‘instructions’ of mRNA

polypeptide

chain of amino acids