Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Biology Expert

problem 1) Which of the following statements are true?

All cells

(a) are specialised         (d) contain chloroplasts
(b) have a cell wall        (e) have a cell membrane.
(c) have cytoplasm                                          

problem 2) Match the following functions to cell structures listed below:

(a) controls cell division          (c) controls entry of substances into a cell
(b) produces energy,              (d) encloses a plant cell.

mitochondrion, cell membrane, nucleus, cell wall

problem 3) From the list below choose elements and compounds which you would expect to find in each of (a) proteins, (b) starch, (c) lipids.

nitrogen, glucose, carbon, amino acids, fatty acid, sulphur, oxygen, glycerol, hydrogen (A/R)

problem 4) A suspension of yeast is dropped into some hydrogen peroxide in the test-tube. The hydrogen peroxide fizzes vigorously and gives off oxygen.

(a) What further experiment must be carried out to test hypothesis that the enzyme in the yeast catalyses the breakdown of hydrogen peroxide?

(b) What result will (i) support the hypothesis, (ii) destroy the hypothesis?

(c) Describe your answers to (b). 

problem 5) A student's account of an experiment reads as follows:

I placed some diastase powder (a starch-digesting enzyme) in some starch solution in a test-tube. By taking samples from the tube and testing them with iodine, I found that the starch   gradually disappeared.

I repeated the experiment but added a few cubic centimetres of dilute sodium carbonate (an alkali) to the starch solution before adding the diastase. The starch took longer to disappear. I concluded that diastase had an optimum pH of 7 (neutral).

Criticise (a) the student's experimental design (as judged by the report), (b) the student' s interpretation of the results

problem 6) Which of the following statements best describes the process of respiration?

Respiration in living organisms is:

(a) the intake of oxygen and output of carbon dioxide
(b) the intake of food and the output of energy
(c) the intake of food and the release of carbon dioxide
(d) the breakdown of food to release energy
(e) the oxidation of food to carbon dioxide.                                                                                  

problem 7) Describe what an oxygen debt is and how it is caused.                                                                                        

problem 8) When carbohydrate is oxidised to carbon dioxide and water in the body, 21 kJ energy is produced for every litre of oxygen used. In an experiment, a girl absorbed 2 litres of oxygen in 10 minutes. What is her energy production in kilojoules per hour?

Biology, Academics

  • Category:- Biology
  • Reference No.:- M95242

Have any Question? 


Related Questions in Biology

Dolly dolly and more dollyit all started with a sheep named

Dolly, Dolly, and More Dolly It all started with a sheep named Dolly. In the mid-1990s, scientists proved convincingly that after decades of trying, we could, indeed, clone mammals - and even possibly, human beings. Unsu ...

A 26-year-old business executive complained of a dull pain

A 26-year-old business executive complained of a dull pain (heartburn) behind the sternum. The painwas postprandial (occurred after meals) and disappeared within a few minutes to an hour. It was oftenassociated with belc ...

With which archaic human species did some of the ancestors

With which archaic human species did some of the ancestors of modern Europeans interbreed during the past 100,000 years?

Assignment biology concepts and investigations marielle

Assignment: BIOLOGY CONCEPTS AND INVESTIGATIONS. MARIELLE HOEFNAGELS. THIRD EDITION 1. (CHAPTER1) Imagine that you are a scientist working with one of the first research teams sent to the planet Mars. One day, while digg ...

What principles a health care practitioner should follow

What principles a health care practitioner should follow during the participation in media?

Please describe four different categories of tissue

Please describe four different categories of tissue engineering strategies for repairing bone and cartilage injuries separately, and compare the advantages and disadvantages of these strategies.

1 how does gel electrophoresis sort dna fragments2 if

1. How does gel electrophoresis sort DNA fragments? 2. If each individual has such a small amount of DNA, how do the bands on the gel contain enough DNA to be visible? 3. Many genes only have a few possible alleles. For ...

In essay form a identify discuss and explain at least 4

In essay form a) Identify, discuss and explain at least 4 actions that can result in changes in chromosome structure. b) Explain why changes in nucleotide sequence could result in the production of different proteins. Be ...

Embryonic pattern specification during development in some

Embryonic pattern specification during development in some cases requires maternally contributed ‘determinants', and in others is regulated by signaling between cells. For each of the following developmental events, indi ...

Imagine two parents are both heterozygous for two autosomal

Imagine two parents are both heterozygous for two autosomal genes. Assuming independent assortment, what proportion of their offspring are expected to have the same phenotype (for these two traits) as the parents? A) 0.2 ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro

Describe what you learned about the impact of economic

Describe what you learned about the impact of economic, social, and demographic trends affecting the US labor environmen