Download Which substance is a base that is found in DNA? What is a possible

Which substance is a base that is found in DNA?
What is a possible consequence of two base substitution mutations occurring in the same
gene?
Aerobic respiration involves conversion of glucose into pyruvate and conversion of pyruvate
into carbon dioxide and water. Where do these processes occur in a eukaryotic cell?
The percentage of bacteria showing antibiotic resistance in Neisseria gonorrhoeae and other
species of disease-causing bacteria has risen considerably since antibiotics were
introduced. What has caused this increase?
What sequence of organs do substances pass through, as they move through the human
digestive system?
Mouth  esophagus  stomach  small intestine  large intestine  anus
How do skin and mucous membranes act as barriers to infection?
Skin is tough and forms an effective
physical barrier.
Pathogens are trapped by sticky
mucus.
Arterioles in the skin contain muscle fibres which contract. What is the function of these
fibres?
B
A.
To move capillaries further from the skin when the body is too cold
B.
To reduce blood flow to the skin when the body is too cold
C.
To move capillaries closer to the skin when the body is too warm
D.
To increase blood flow to the skin when the body is too warm
In the menstrual cycle in humans, which hormone causes the wall of the follicle to develop
after ovulation and to secrete more progesterone?
Lh
he following is a dichotomous key for a group of beetles.
1.
Wing cases with spots
Wing cases without spots
Ladybird
2
2.
Elongated head
Head not elongated
Weevil
3
3.
Long antennae
Short antennae
Longhorn beetle
4
4.
Wing cases shorter than body
Wings cases as long as body
Oil beetle
Colorado beetle
(a)
Using the key, identify the following beetles.
A:
B:
C:
D:
E:
(b)
oil beetle;
longhorn beetle;
Colorado beetle;
weevil beetle;
ladybird beetle;
n1 n2
2010
or
;
n3
5
= 40;
What is the role of the internal intercostal muscles during ventilation of the lungs?
A.
Increasing the pressure in the thorax
Which processes always occur in meiosis but not normally in mitosis?
I.
Chiasmata formation
II.
Recombination of genes
2 max
III.
Separation of homologous chromosomes
What part of spermatogenesis in humans takes place while spermatids are associated with
Sertoli cells?
A.
Cell differentiation