Yr10 Biology Mock Answers Flashcards
 what is a tissue
A group of similar cells. (Which all do the same job)
Aspirin is a painkiller, which plant does aspirin originate from
Willow
Scientist have extracted chemical afrom the deadly nightshade plant
Chemical a can be used as a painkiller
The scientist usually extract, chemical a from the berries of the deadly nightshade
Suggest one reason why berries are use instead of leaves or roots
Easier to pick/harvest
Easier to extract chemicals
Less likely to harm the plant
Less likely to contain a toxic dose
Suggest one reason why the leaves of a deadly nightshade plants have chlorosis
They look yellow due to the lack of chlorophyll
It is a sign of magnesium deficiency
Suggest one reason why are you a part, making claims about the effects of chemical a may be biased
To help competitors sell their alternatives
Which part of the heart receives oxygenated blood from the lungs?
Left top
Which part of the heart pumps deoxygenated blood to the lungs?
Right bottem
A group of cells called the pacemaker control, the resting heart rate
Where in the heart is the pacemaker found?
Right atrium
Figure two shows a cross-section of an artery and a vein
Describe two ways that the structure of an artery is different from the structure of a vein
Arteries have thicker muscle, thicker elastic tissue, A narrow lumen, no valves
Explain the effect of a partially blocked coronary artery on the human body
Reduce blood flow would reduce oxygen and glucose
Muscle cells can do less aerobic respiration
More anaerobic respiration would happen instead, this releases less energy
Causes reduce muscle contraction
Reduces the ability to circulate blood to the body
Less glucose, plus oxygen circulated
Less CO2 removed
More likely to feel tired
More likely to feel breathless
Chest pains due to lactic acid in heart muscle
How do you salmonella bacteria in food, causes symptoms of vomiting and diarrhoea?
The bacteria produce toxins
Explain how the new systems of animals respond to vaccination, the nearest font in farm animals prevent an outbreak of food poisoning in humans
White blood cells begin to produce antibodies
The antibodies bind to fit onto salmonella antigens
Memory cells, stay active in the future to make high numbers of antibodies quickly
If farm animals have immunity, the chance of humans, eating infected food is far lower
Describe to aseptic technique The scientist should use in a antibiotic investigation
Disinfect your hands/worksurfaces
Use sterilise equipment
Flame any equipment before use
Work near a roaring Bunsen
Keep the agar covered with the Petri dish lid
Use tape to seal the dish
The scientist incubated the bacteria at 37°
Students in school lavatories, incubate bacteria, 25°
Explain why scientist is 37°, but students much is 25° to incubate bacteria
37° is a human body temperature
Salmonella would grow quickly at 37°, which is ideal for a scientist
But 25° is more safe for students as it prevents the growth of harmful bacteria
What is the purpose of the paper disc with no antibiotic in figure for
It is a control to prove the antibiotic is having any effect
This question is about exercise
During vigourous, exercise, anaerobic respiration occurs in a persons body
Explain to effects of anaerobic respiration in the persons body
Oxygen debt starts to build up due to increasing lactic acid
Heart rate rises to deliver more oxygen to remove lactic acid
Design an investigation to show the effect of different types of exercise on the heart rate of athletes
A group of athletes should be used
Should be asked to complete at least two physical activities are varied type
The heart rate of each participant should be measured before an after exercise
Calculate the average change in heart rate caused by exercise type a then type b
Compare the difference to see which exercise have the biggest effect
Factors to control:
Test males and females
Standardise level of activity for each test
Some people completing both exercise
Give time to recover before second exercise
Explain how take an anabolic steroids could improve an athletes performance
Increase muscle mass gives greatest strength
This makes an athlete faster/stronger in competitions
Describe how scientist make monoclonal antibodies using the cell created when a mouse lymphocyte and a tumour cell combined
Allow a hybriddoma to grow, and divide
All the cells will produce the same Antibody
The antibodies can be collected and purified
suggest the purpose of a control area in a test strip
Show the test is working
What term describes an organism that passes a pathogen from one person to another?
Vector
The malaria, a protist is an eukaryotic cell
Describe three ways to structure of the malaria, a protist is different from the structure of a prokaryotic cell
Malaria cells have a mitochondria/a nucleus prokaryotic cells do not
Prokaryotic cells have plasmids/genetic material in the cytoplasm, but malaria does not
Prokaryotic cell have a cell wall, but malarial cells do not
During one stage of malarial infection, the malaria, a protist enter red blood cells and cause them to burst
Explain why the bursting of red blood cells causes tiredness
Less oxygen can be carried by the blood, reduction in aerobic respiration to release of energy
Malaria, a protist produces sexually and asexually during the life-cycle
Complete the table to give three differences between sexual reproduction and asexual reproduction
Sexual reproduction
Involves fertilisation/fusion of gametes
Produces genetically varied offspring
Relies on meiosis
Asexual reproduction
Does not involve fertilisation
Produces genetically identical offspring
Relies on mitosis
