Ask Question, Ask an Expert


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

The lac operator binds the lac repressor the dna sequence

The lac operator binds the lac repressor. The DNA sequence of the lac operator shares a characteristic with the DNA sequences of the binding sites of many restriction enzymes. What is this common characteristic?

All cells on earth use mrna to make protein rather than

All cells on Earth use mRNA to make protein rather than using DNA directly. Why is it more advantageous to make protein from mRNA rather than directly from DNA in prokaryotic cells?

Assignment professional standards and institutional

Assignment: Professional Standards and Institutional Ethics In each case, answer the questions at the end of the case and give researched references to support your assertions; also, explain what would be the ethical cou ...

Antropology book reviewanthropology 105book response value

Antropology Book Review Anthropology 105 Book Response (Value 20 points) Length: 750-1000 words, not including quotes or references Times New Roman Double spaced Late penalty: 1 point per day Review your worksheet respon ...

Cell cycle checkpoints are an important feature of a

Cell cycle checkpoints are an important feature of a dividing cell to reduce errors that can occur in various stages of the cell cycle. Loss of Rb, an important part of the G1-S transition checkpoint, can result in uncon ...

Steroid hormones such as testosterone are derived from

Steroid hormones, such as testosterone, are derived from cholesterol. What type of macromolecule are they?

Looking for assistance with the below information regarding

Looking for assistance with the below information regarding alternatives to landfills.  References are needed. Alternatives to Landfills The use of sanitary landfills for burial of municipal solid wastes has been the pri ...

Of the four chambers of the human heart which has the

Of the four chambers of the human heart, which has the thickest walls, and why? Why can you not catch the same cold twice, but a new cold will make you sick for a week or two? What is the key step in spermatogenesis that ...

What principles a health care practitioner should follow

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

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 ...

  • 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

WalMart Identification of theory and critical discussion

Drawing on the prescribed text and/or relevant academic literature, produce a paper which discusses the nature of group

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