May 2022 SL Flashcards
(30 cards)
A cell contains chloroplasts, plasma membrane and 80S ribosomes. What type of cell could it be?
Bryophyte
More than 90% of cellular cholesterol is located in the cell’s plasma membrane. What is the
main role of cholesterol in the plasma membranes of mammalian cells?
To regulate membrane fluidity
What is/are required for facilitated diffusion?
I. A concentration gradient
II. ATP
III. A channel protein
I and III only
Which cell component arose first during the formation of the earliest cells?
Plasma membrane
In the chimpanzee (Pan troglodytes), the haploid number of chromosomes is 24. How many
sister chromatids are present in the G2 phase of a somatic cell, such as a cell in the bone marrow
of the chimpanzee?
96
What are linked by hydrogen bonds?
Hydrogen and oxygen in different water molecules
Which reaction occurs when a dipeptide is formed from amino acids?
Condensation
What is the reason for the drop in enzyme activity above 40°C?
Changes to the conformation of the enzyme
A molecule of DNA is found to contain 200 guanine bases, representing 25% of the total number
of bases. How many phosphate groups does this molecule of DNA contain?
800
What is the minimum number of nucleotides needed to code for a polypeptide composed of
210 amino acids?
630
Which hypothesis provides the most likely explanation for the curve?
As exercise intensity increases, lactate is converted back to glucose.
What is the limiting factor at X?
Temperature
What can be deduced from the information in this table?
Humans produce about half as many proteins as rice.
Chromosome numbers vary between species. Which statement refers to humans?
An egg cell has two X chromosomes.
What is produced by meiosis in a cell of a male animal?
Four gametes, each with the same number of chromosomes
Huntington’s disease is an autosomal dominant genetic disease. What are the chances of
two parents that are heterozygous for the gene having a child with Huntington’s disease?
75%
What is a community?
A group of populations interacting with each other within a given area
Which pyramid of energy represents this information?
Eagles
Snakes
Mice
Seeds
Which processes are taking place at X and Y?
respiration combustion
Mammals, birds and reptiles have an embryonic tail that may disappear during development.
What is the most likely explanation?
All vertebrates have a common ancestor
What can be deduced from this graph?
Bacteria with beneficial adaptations survive and pass on their genes.
The plant in the diagram has vascular tissue and reproduces by spores.
To which phylum does the plant belong?
Filicinophyta
Which cladogram best represents the relationship between the five species?
A.
Q T S R P
Which process describes starch metabolism in humans?
Glucose produced by the digestion of starch can be stored as glycogen.
