9700 P1 Practice

9700 P1 Practice

By Summaiya Razman

Multiple Choice

The eyepiece of a microscope is fitted with an eyepiece graticule and a stage micrometer scale is placed on the microscope.

Which statements about the stage micrometer scale are correct?

1 The scale can be used to measure the actual length of cells directly.

2 The scale allows you to calibrate the eyepiece graticule.

3 Less of the scale is visible as the objective lens changes from x10 to x40.

• 1, 2 and 3

• 2 and 3

• 1 only

• 2 only

Multiple Choice

Which cell structures are required for the formation of lysosomes and the hydrolytic enzymes that they contain?

• A

• B

• C

• D

Multiple Choice

Which cell structures contain rRNA?

1 chloroplast

2 mitochondrion

3 nucleus

4 smooth endoplasmic reticulum

• 1, 2, 3 and 4

• 1, 2 and 3 only

• 1, 2 and 4 only

• 3 and 4 only

Multiple Choice

The single-celled organism Thiomargarita namibiensis measures 700 micrometer in diameter and is enclosed in a cell wall. The genetic material of T. namibiensis is located free in the cytoplasm where it occurs as thousands of copies of circular DNA. Most of the cell is taken up by a large vacuole, which stores essential chemicals for metabolism. Which statement is correct?

• It must be a eukaryote because a diameter of 700 micrometer is too large for a prokaryote.

• It must be a plant because it contains a vacuole.

• It must be a plant because it is enclosed in a cell wall.

• It must be a prokaryote because its DNA is circular and located in the cytoplasm.

Multiple Choice

Which general formula is correct for monosaccharides such as fructose?

• (CHO)n

• (CH2O)n

• (CHO2)n

• (C2HO)n

Multiple Choice

Which statements can be used to describe the structure of cellulose?

1 a polymer of glucose monomers linked by beta-1,4 glycosidic bonds

2 a polysaccharide of hexose monomers

3 an unbranched macromolecule made of beta-glucose monomers

• 1, 2 and 3

• 1 and 2 only

• 1 and 3 only

• 2 and 3 only

Multiple Choice

Which molecules contain at least two double bonds?

• saturated fatty acid, collagen and haemoglobin

• collagen and saturated fatty acid only

• haemoglobin and collagen only

• saturated fatty acid and haemoglobin only

Multiple Choice

Complete hydrolysis of polysaccharides requires all the glycosidic bonds between the monomers to be broken.

Enzyme X only breaks alpha-1,4 glycosidic bonds. Which row shows how completely enzyme X can hydrolyse molecules of glycogen and amylose?

• A

• B

• C

• D

Multiple Choice

Which graph correctly shows possible changes in energy levels as a chemical reaction progresses with or without an enzyme?

• A

• B

• C

• D

Multiple Choice

The graph shows the relationship between the concentration of substrate and the rate of an enzyme-catalysed reaction.

Which row shows how Km and Vmax for this enzyme would be affected if the same reaction was carried out in the presence of a competitive inhibitor?

• A

• B

• C

• D

Multiple Choice

Liver cells contain vesicles that have proteins in their membranes which are specific for the transport of glucose. When these cells need to take up glucose, the vesicles fuse with the cell surface membrane. How does the uptake of glucose occur?

• exocytosis

• diffusion

• endocytosis

• facilitated diffusion

Multiple Choice

Which description is correct?

• A centromere holds two chromatids together until the end of prophase and attaches to the microtubules of the spindle.

• A chromatid is one of two identical parts of a chromosome and is made of proteins and two molecules of DNA.

• A chromosome is a structure with two identical parts, made of DNA and proteins, found in the nucleus of a prokaryotic cell.

• A telomere is a sequence of DNA nucleotides, such as GGGTAA, repeated many times and found at the ends of each chromatid.

Multiple Choice

During metaphase, a scientist stains the chromosomes of a diploid animal cell with fluorescent dye to allow the telomeres to be observed. This cell has 26 chromosomes. How many telomeres will the scientist observe?

• 26

• 52

• 78

• 104

Multiple Choice

Uncontrolled cell division can result in the formation of a tumour. Which part of the cell cycle would take less time during the formation of a tumour?

• cytokinesis

• interphase

• mitosis

• telophase

Multiple Choice

The mRNA sequences of the three stop codons are shown. UAA UAG UGA Which mutation in the template (transcribed) strand of a DNA sequence that codes for a polypeptide would cause translation to stop prematurely?

• ATT changed to ATC

• ACT changed to ACA

• ACC changed to ATT

• ATC changed to TAG

Multiple Choice

Which features of companion cells are essential to their function?

1 They are connected to the sieve tube elements by plasmodesmata.

2 They have a thicker cell wall than a sieve tube element.

3 They contain a nucleus and mitochondria.

• 1 and 2

• 1 and 3

• 1 only

• 2 and 3

Multiple Choice

Which statements about water movement in plants are correct? 1 Water can pass through cellulose cell walls. 2 Water cannot pass through lignified cell walls. 3 Water can pass through cell walls that contain suberin

• 1, 2 and 3

• 1 and 2 only

• 1 and 3 only

• 2 and 3 only

Multiple Choice

Which statements are correct?

1 Compared with blood, tissue fluid has less protein and no red blood cells.

2 Lymph may contain lipids, carbon dioxide and phagocytes. 3 Tissue fluid contains glucose, amino acids, urea and carbon dioxide.

• 1, 2 and 3

• 1 and 2 only

• 1 and 3 only

• 2 and 3 only

Multiple Choice

Which statements about the formation of haemoglobinic acid are correct?

1 It can only occur with the dissociation of oxygen from haemoglobin.

2 It removes excess hydrogen ions, preventing blood from becoming too acidic.

3 It is linked to the action of carbonic anhydrase.

• 1, 2 and 3

• 1 and 2 only

• 1 only

• 2 and 3